Unholy still has its pet. Also Ive played unholy as my main spec from Wrath release to currently, and have always found the dps to be great, even now while everyone says its low I find myself topping the meters, on aoe always #1 and on single target in 25 man ussually one but never outta top 5

Peoples saying WOTLK's DK was more fun than mop dks just did not play wotlk, or lies

Sorry, but that's not how it works. Just because you disagree with someone's opinion, doesn't make them a liar. It's all fine and dandy, if you didn't like the WotLK DK, but that doesn't make your opinion the universal truth nor does it make everyone else being wrong/just a liar.

On topic, I liked the WotLK Blood tanking more than now - of course, Blood is still the tanking spec, my main gripe is actually with the change to rune mechanic in Cataclysm, I never got the hang of it again, leading to me abandoning the class. (though I admit, I had liked Pestilence refreshing runes, too, since I prefer my class/spec's playstyle fairly simple, and the challenge in encounters, not playing my character)

I could probably learn it by levelling another DK (transferred my old one away with some FCM to free a spot), but don't really feel like it (paladin and/or druid are my new tanks of choice), and I have no free character slots anyway.

I liked that the rune system wasn't so unnecessarily complicated, and wasn't just a random chance mess. You could actually get a rotation in that you could count on, and worry more about fight mechancs :P

Lk DKs kicked ass, i miss the old unholy blight and later arp blood dps.

Because they were the new hero class, or FOTM just like monks are / was at MoP release, being stupidly op because blizzard wants a lot of players on a type of class to get feedback n' numbers will eventually get brought down to normal levels.

Miss blood dps too much to vote for anything other than wotlk. The spec made 2h frost look like it was hitting with a foam sword.
I also miss tanking or dpsing as any of the 3 specs(never liked frost but each had its place for tanking)
I miss the old rune mechanic. To people that cried about their fingers hurting from having to hit their buttons F*ck you and thanks for the downtime *ssholes
I miss having talents that feel like they matter. With the exception of T1 and T5 dk talents I feel like I could leave the rest of the page blank.